TYBSCIT Semester – VI – DATA WAREHOUSE Question paper APRIL-2015

APRIL-2015

1. Answer any two of the following. 10

a. What are operational databases? Explain the basic characteristics of a data

warehouse.

b. Describe virtual data warehouse and central data warehouse.

c. Explain the various types of additivity of facts with examples.

d. Explain star schema model with the help of a diagram.

2. Answer any two of the following. 10

a. What is a listener? How is it configured?

b. What is design center? Explain the functions of project explorer and connection

explorer windows.

c. Explain OWB components and architecture with a diagram.

d. Explain the various steps involved in installing oracle database software.

3. Answer any two of the following. 10

a. What is a target schema? How is a target module created?

b. What is time dimension? Discuss various steps involved in creating a time dimension

using time dimension wizard.

c. Explain various characteristics of a dimension.

d. Write notes on the following.

i. Slowly changing dimension

ii. Surrogate keys

4. Answer any two of the following. 10

a. What is ETL? Explain the importance of source target map.

b. What is staging? What are its benefits? Explain the situation where staging is

essential.

c. Briefly, explain the functions of filter and joiner operators.

d. What are data flow operators? Explain the concept of pivot operator with an

example.

TYBSCIT Semester – VI – DATA WAREHOUSE Question paper APRIL-2015

APRIL-2015

5. Answer any two of the following. 10

a. What is the purpose of main attribute group in a cube? Discuss dimension attributes

and measures in the cube.

b. What is expression operator? Explain the mapping of a date field SALE_DATE to a

numeric field DAY_CODE by applying TO_CHAR() and TO_NUMBER() functions

through expression operator. The string format for TO_CHAR() function is

‘YYYMMDD'

c. Explain the concept of validating and generating.

d. What is object deployment? Explain the functions of control center manager.

6. Answer any two of the following. 10

a. What is recycle bin? Describe the features of warehouse builder recycle bin window.

b. Explain data sparsity and data explosion.

c. What is a snapshot? Explain full snapshot and signature.

d. Explain the export feature of Metadata Loader.

7. Answer any three of the following. 15

a. Write any five significant differences between OLTP database and Data warehouse

database.

b. What are the hardware and software requirements for installing oracle warehouse

builder?

c. Explain multidimensional implementation of data warehouse.

d. What are mapping operators? Explain any two source-target mapping operators in

detail.

e. What are the two ways of validating repository objects in object editor?